Improved lock and key



UNITED STATES JAMES R. BUGBEE, OFA BOSTON, MASSACHUSETTS, ASSIGNOR TO IBGBEE dr PAT-ENT OFFICE.

ROBINSON.

Specification forming part of Letters Patent'No. 8,060, dated April 22, 185i.

T0 all whom t may concern:

Beit known that I, JAMES R. BUGBEE, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Powder-Proof Locks for Safes, Bank-Vaults, dre.; and I do hereby declare that the same is fully described and represented in the following specification and accompanying drawings, letters, figures, and references thereof. A

In the said drawings, Figure l denotes a side view of a lock having my improvement. Fig. 2 shows the same as it appears when the cover--plate of the case or box is removed. Fig. 3 is a vertical and transverse section of the lock, taken through the revolving keyblock. Fig. 4 is a side view of the separate bit-plate or secondary key. Fig. 5 is a side View of the wedge-key to be hereinafter described.

In the said drawings, A represents the case or box of the lock made in the usual manner and with a movable cover-plate B, which is confined in place by screws a ct.

O is the bolt, whose stud b operates in connection with a series of tumblers or slideplates D D D, dac., in the usual Way, each of the said tnmblers being provided with a depressing-spring E.

F is a block of metal so adapted to the lock- Ycase as to be capable of being partially revolved, it having cylindric journals c d, which rest and move in corresponding apertures or bearings made, respectively, in the two side.

plates B G of the lock-case. One at least of these journals is made to extend entirely through the cover-plate or side plate of the lock. A rectangular recess or key-hole cavity e is sunk within the block. A set of tumbler-elevators or pins fff is inserted in the block and between the orifice e and the tumblers, there being a pin f to each tumbler, and each pin being made to extend into the cavity e and so adapted to the block as to be capable of being freely slid or moved upward or against its tumbler, so as to cause the elevation of the same.

A side vie-w of one ofthe pinsff, the., is given in Fig. 6, wherein it will be seen that the said pin is provided with a stop or head c, which, when the pin is at its lowest position, rests on the upper part h of the turning block F.

These pins or tumbler-elevators are made of equal lengths and operate in conjunction with a separate bit-plate or secondary key H. (Represented in Fig. 4.) This plate is made with a series of bits z' la Z m n o, corresponding in number with that of the tumblers and elevators. It is also made with a straight bottom p q, an inclined plane q 1r, and a hook s or other equivalent contrivance, which, in`

connection with a hook t on the end of the key I, (see Fig. 5,) enables a person to extract` or remove the key H from the orifice or cavity e. The said key I is lnade with a wedge or inclined cam or plane u fu and a Vplane surface o w on the post which is constructed of a width to correspond with and enter that of the key-hole orifice e. The bolt is moved by means of a projection y, wh ich extends from the block F, and' has a cavity or recess z madeinit, and so as to receive a stud a from thebolt,the sameoperatingsomewhatasacommon key operates in throwing the bolt either backward or forward, the form of the said projection y and the recess being denoted in Fig. 2 by dotted lines.

In operating the lock the secondary key or bit-plate is first inserted within the orifice or key-hole e of the block F and with its bits standing upward or toward the elevators. Next rthe part Qc ofthe key I is forced end wise into the said cavity, so as to carry the in- -clined surface wedge or cam u fo against the cam or inclined surface q of the bit-plate and elevate t-he bit-plate and cause the part p q of it to rest upon the parte w ofthe key I.

This operation will throw the bits against their respective tumbler-elevators and thereby raise up the tumblers, so as to carry all their cross or horizontal slots o into proper position to allow the stud. or pin b of the bolt to pass through them. Now if we apply force to the key I, so as to turn it andthe block F, we may throw the bolt either forward or back- Ward, it being understood that the bearingsurfaces of the tumblers on the tumbler-ele` Vaters are to be so curved as to create no motion of the tumblers during such motions of the bolt.

A lock soV constructed can be made not only powder-proof", but with so many tumblers as to be of great value as a protector against the operations of burglars, whether they be such :ts are commonly resorted to in order to pick whole being constructed, arranged, and operit, or blow it up, or injure it by gunpowating substantiallyas bereinbefore specified. deroranyotherexplosive material introduced In testimony whereof I have hereto set my into it. L signature this 6th day of March, A. D. 1851.

What I claim as my invention isl y The wedged or cam key I and the separate JAMES R. BUGBEE. bit or secondary wedged or calm key H, in Ttnessesr combination with the vibrating block F, the R. IVI. EDDY,

key-recess and the tumbler-elevators, the BENJAMIN EDDY. 

